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3(5n+5)-6(2n+3)=12
We move all terms to the left:
3(5n+5)-6(2n+3)-(12)=0
We multiply parentheses
15n-12n+15-18-12=0
We add all the numbers together, and all the variables
3n-15=0
We move all terms containing n to the left, all other terms to the right
3n=15
n=15/3
n=5
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